What rhymes with from?

In English Dictionaries which show phonetic symbols for pronunciation, the O in the Word COME is pronounced like the U in UP. So COME rhymes with hum.

The O in FROM is pronounced like the O in HOT. So FROM rhymes with bomb. (The final 'b' in bomb is silent, by the way!)

However, there are many English dialects and accents, and it is possible that some people speak English in such a way that come and from may actually rhyme with each other in their accent.